Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 157)

9–19 Diagnostic Counters
Publication 1770Ć6.5.16 - October 1996
1771ĆKG,ĆKGM Diagnostic Counters
Asynchronous Link Diagnostic Counters
This counter byte Counts the number of
0, 1
Times a node attempted to send a message.
2, 3 Messages that were successfully transmitted and ACKed.
4, 5 ACKs that were received.
6 ACKs successfully passed from the receiver's separator to the
transmitted.
7 NAKs received
8 NAKs passed from the separator to the transmitter.
9 Timeouts waiting for a response.
10 ENQs sent.
11 Messages that could not be successfully sent.
12 Reply messages that could not be forwarded and were destroyed.
13, 14 Messages received.
15, 16 ACKs sent.
17 NAKs sent.
18 ENQs received.
19 ReĆtransmissions received and ACKed.
A reĆtransmission is a message that has a transparent word,
command, and source that match the previous message.
20 STX (fullĆduplex mode) or SOH (halfĆduplex mode) received.
This is a count of the number of messages that were started.
21 Messages, characters, or message fragments that were ignored.
22 Messages that were aborted by receipt of a DLE ENQ.
23 Messages that were aborted by the receipt of an unexpected control
code other than DLE ENQ.
24 Times DLE ACK response was delayed because of a lack of buffer
space for the next message.
25 Times reply was changed from ACK to NAK because unexpected
characters (any besides DLE ENQ) were received while waiting for
memory to free up.
26 Broadcast messages received.
27 Broadcast messages that were successfully received.
28 Messages seen that were not for this node.
29 Poll messages received for this node.
30 DLE EOTs sent.
31 Calls received.
32 Times phone was hung up by the module.
33 Times DCD was lost.
34 Times the phone was hung up because of a DCD timeout.